Portable machine for shearing steel rods, wire ropes and the like



1959 KAZUNOSUKE NAITO 2,915,822

PORTABLE MACHINE FOR SHEARING STEEL RODS, WIRE ROPES, AND THE LIKE FiledMarch 4, 1959 v ATTOEN Ey United tates atent G PORTABLE MACHINE FGRSHEARING STEEL RODS, WIRE ROPES AND THE LIKE Kazunosuke Naito, Tokyo,Japan Application March 4, 1959, Serial No. 797,122

Claims priority, application Japan March 11, 1958 2 Claims. (Cl. 3025tl)This invention relates to a simple portable machine which makes possibleto shear easily by means of human power steel rods, wire ropes, and thelike.

This portable machine for shearing steel rods, wire ropes, and the likeconsists of two pieces of disk-shaped cutters pivoted together, each ofwhich has a U-shaped groove provided in the periphery thereof. Thecutters are connected with a link whose ends are freely rotatable aroundpins of which one is fixed to a long arm extend ing from one of theabove disk-shaped cutters and the other is disposed eccentrically to ashort shaft provided in a short arm extending from the other disk-shapedcutter. Further, to the aforesaid short shaft, not only a ratchet wheelis fixed but also a hand lever is attached as to be freely rotatable.This hand lever is provided with a antireversing device for makingpossible the intermittent rotation of the aforesaid ratchet wheel by thereciprocating movement of said hand lever. Further objects andadvantages of my invention will appear from the detailed description.

Figure l is a plan view with a partial section of a portable machineembodying my invention and the chain line shows its movement.

Figure 2 is a side view with a partial section of the portable machineof Figure 1.

The following is an explanation of the drawings: The disk-shaped cutterL has on its periphery a U-shaped groove 2 whose edges are formed intocutting blades. Likewise, the disk-shaped cutter 1A has in its peripherya U-shaped groove 2A, and these two disk-shaped cutters 1 and 1A arepositioned one on top of the other and are pivoted in their center witha shaft 3. From the diskshaped cutters 1 and 1A extend in one body ashort arm 4 and a long arm 5, respectively, with the tip of the long arm5 being the handle 6. At the end of the short arm 4 a short shaft 7 isfitted so as to be freely rotatable and on one side of it, i.e., theside of the long arm there is provided in one body and adjoining theretoa revolving disk 8 which is larger than the short shaft 7 and on theopposite side there are provided in one body and adjoining to the shortshaft 7 in order a square shaft 9 slightly smaller than the short shaft'7 and a round shaft 10 of a still smaller diameter having screw threadson its tip. On the revolving disk 8 at the outer edge there is providedprojecting therefrom a pin 11 eccentrically to the shaft 7. The ends ofa link 13 are coupled at one end to this pin 11 and at the other end toa pin 12 provided at a suitable location on the long arm 5 andprojecting therefrom with both ends being freely rotatable. A ratchetwheel 14 having a square hole is fitted unrotatably to the aforesaidsquare shaft 9 and to the round shaft 10 and eyed piece 16 projectingfrom one side of the tip of the hand lever is fitted as to be freelyrotatable. 17 is the nut which is screwed into the screw thread at thetip of the round shaft 10. At the base of the above eyed piece 16 in thetip of the hand lever 15 there is a small hole in which is fitted aspring 19 and a sliding stop 20. In between the aforesaid ratchet wheel14 and the sliding stop 20 a switching piece 22 is pivoted to a pin 21afiixed to the eyed piece 16, and this switching piece 22 is providedwith pawls 23 and 24 at the tips thereof and a projection in its middle.

The portable machine for shearing steel rods, wire ropes, and the likeof this invention is used as follows:

This machine is first made to assume the position as shown in Figure 1,i.e., where the U-shaped grooves 2 and 2A are in alinement with eachother. The wire rope and the like to be sheared are then placed in thesegrooves and the hand lever 15 is actuated with a back and forth motion.When this is done, the ratchet wheel 14 is made to rotate intermittentlyin the direction A as shown by the arrow in Figure l by means of thepawl 23, and concomittantly with a linked motion of the revolving disk8, the pin 11 and the link 13 occurring, the distance between the shortarm 4 and the long arm 5 narrows as shown by the chain line in Figure l.Simultaneously with this the grooves 2 and 2A becoming staggered inrelation to each other, the shearing of the wire rope and the like iscompleted. When it is necessary that the arms 4 and 5 that have oncebeen made to approach each other be separated as when it is desired tostop the shearing midway, the switching piece 22 is turned with thefingers and the pawl 24 is made to engage the ratchet wheel 14 while atthe same time the projection 25 is made to move to the other side of thesliding stop 20. In this case, by the back and forth movement of thehand lever 15, the ratchet wheel 14 turns opposite to the direction ofarrow A and thus the arms 4 and 5 are moved away from each other.

And thus the machine of this invention being of very simple constructioncan be made light in weight, and moreover because of its ease andsimplicity of manipulation, it is especially suitable for shearing wireropes and the like at high places above the ground.

Although certain embodiments of the invention have been shown anddescribed for purpose of illustration, it is to be understood that theinvention may be applied to various uses and that changes andmodifications may be made therein as will be apparent to a personskilled in the art What is claimed is:

1. A portable machine for shearing steel rods, wire ropes, and the likewhich comprises two pieces of diskshaped cutters pivoted together, eachhaving a U-shaped groove in the periphery thereof, characterized in thatsaid cutters are connected with a link whose ends are freely rotatablearound .pins of which one is fitted to a long arm extending from one ofsaid disk-shaped cutters and the other is disposed eccentrically to ashort shaft provided in a short arm extending from the other of saiddisk-shaped cutters, and further, a ratchet wheel is fixed to said shortshaft together with a hand lever attached as to be freely rotatable,said hand lever being provided with an antireversal means forintermittently rotating said ratchet wheel with the reciprocatingmovement of said hand lever.

2. A portable machine for shearing steel rods, wire ropes, and the likeaccording to claim 1 wherein a switching piece having pawls at both ofits tips and a projection in the middle thereof is pivoted to an eyedpiece at the tip of a hand lever, said hand lever being provided with asliding stop engaging said projection and a spring which presses saidsliding stop.

No references cited.

